The planet defenses.

[catswift]

If you mean 1M population it will be pretty low.

When it's beaten, yes, it becomes property of the attacker. Depending on how long the fight lasted the population might be reduced to a quarter of what it was, or might not change much at all

I would also like some indication as to the attack and defense numbers of a 400u planet. Throwing ships at one and getting no feedback as to how effective my ships were is... silly.